Paper-cutting machine



(No Model.)

H. L. SANBORN. PAPER CUTTING MACHINE.

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NTTED STATES PATENT OFFICE.

HERMANN LORD SANBORN, OF PLEASANTVILLE, NEV YORK, ASSIGNOR,

BY MESNE ASSIGNMENTS, TO JAMES A. SKILTON, TRUSTEE, OF BROOK- LYN, NEW YoRk.

PAPER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent N o. 600,338, dated March 8, 1898.

Application filed February 6, 1897. Serial No. 622,294. (No model.)

To @ZZ whom, it 71u03/ con/cern:

Be it known that I, HERMANN LORD SAN- BORN, of the town of Pleasantville, county of Vestchester, and State of New York, have invented a new and useful Improvement in Paper-Cutting Machines, of which the following is a specification.

My invention relates to improvements in clamping devices for paper-cutting machines and in the mechanisms for operating the same.

My invention is illustrated in the accompanying drawings, in Which- Figure lis a rear view. Fig. 2 is a part vertical sectional view cut on the line 2 2, Fig. l. Fig. 3 is a horizontal sectional view cut on the line 3 8, Fig. l; and Fig. l is a part vertical sectional View of the cross-bar and thrust-block.

Similarletters refer to similar parts throughout the several views.

F is the frame of the machine.

O is the clamp or clamp-bar.

K is the cross-bar, which is connected to the clamp-bar by the links L L.

E E are thrust-blocks located in thrustblock boxes or seats O O in the cross-bar and are provided with racks or rack-teeth T on the back side of each to receive the teeth of the pinions l? l?, respectively, whereby the thrust-blocks are moved up and down or made to receive the thrusting power when the clamping power is to be brought to bear upon the clamp-bar and paper and when the clampbar is to be released.

To avoid confusion of parts, no knife-bar is shown, but the knife-bar ways W W are shown, while the other parts of the machine not concerned in clamping are omitted.

G and G are the worm and worm-gear for operating the shaft S and the pinions P P thereon. p

H is the hand-wheel for operating the worm G and the worm-gear G.

The thrust-blocks E E are or may be provided with dovetailed boxes or seats O O, 1ocated in the cross-bar K, or may be held in guides or ways in any other suitable manner. The thrust-blocks E E maybe made as shown or in any other suitable form, so as to be held in-place and permit free motion between the cross-bar and the thrust-block in the rise and fall of each. The thrust-blocks are or may be shouldered or furnished with a head H', projecting at the top toward the front of the machine and on each edge of the thrustblock in order to assist the bottom bearing of the thrust-block upon the cross-bar in transferring the clamping power to and upon the entire clamp-bar in such a way as to distribute strain properly. In other words, the thrustblockhas a head or shoulder projecting on three sides at the top, over and upon the cross-bar, and therefore applies the clamping force in such a way as to avoid tendency to strain or break the cross-bar by distributing the strain.

The cross-bar K is provided with links or other straps L L or attachments on each side connecting it with the clamp or clamp-bar O, through which the clamping power is transmitted from the cross-bar to the clamp-bar, and the cross-bar works in ways in the frame directly under the clamp-bar, which moves in its own ways above.

D is the foot-lever, which is connected to the cross-bar K by a link L', to the lower pin of which is secured the crank-lever A, pivoted to or resting upon the cross-rod R, the short arm of which crank-lever is socketed to receive an adjustable arm A, which carries the counterbalance B.

The machine upon which this invention is an improvement is provided with a cross-bar below the table and connected by links or straps to the clamp-bar above the table. Both cross-bar and clamp-bar are operated or moved in the old machine by pinions meshing into racks at each end of the cross-bar, formed in and on the cross-bar and made integral parts thereof. Consequently the handwheel is used in that machine to lift and lower both the cross-bar and the clamp-bar. In the invention herein set forth the handwheel only lifts and lowers the thrust-blocks, which weigh but a few pounds and are easily moved, and the clamp-bar and cross-bar are counterbalanced by the weight B or its equivalent and lowered by the pressure of the foot of the operator on the foot-lever, while the IOO thrust blocks are held stationary lby the pinions P P. The hand-wheel therefore has but little weight of metal to move in clamping and unclamping, and the machine may therefore be operated with greatly-increased ease and speed, since the hand-wheel is required v K is also carried down, together with the clamp-bar C, unless they'have been brought down by the foot-lever, which is the better' method, until the clamp-bar comes in contact with the paper, and the clamping operation is completed, whereupon after the cut has been made the hand wheel being reversed the thrust-blocks E E are easily and swiftly lifted, and by the action of the counterbalance the cross-bar K is caused to follow the thrustblocks in their upward movement, thereby causing the upward movement of the clampbar C as well and relieving the paper from the contact of the clamp-bar and from the clamping action. In these operations in repetition are to be found the functioning ofthe mechanisms concerned in this invention.

By locating the thrust-blocks and the hand` clamping mechanisms below the table some decided advantages are obtained. The larger part of the vclamping mechanism is kept out of sight and protected, the operator himself is protected from any contact with the operating mechanism, most of the oil necessarily applied to the actuating and moving parts is so placed below the table and the paper as to avoid or protect the paper from damage, and other evident advantages are obtained.

Not only is the clamp-bar counterbalanced, but the cross-bar is also counterbalanced by the same weight, and therefore by the arrangement herein shown, in which the operator is only compelled to lift the weight of the thrust-blocks, if even the weight of them, in releasing the clamping pressure and returning to position for a new clamping operation, the operator is relieved from the burden of incessant labor required in operating the old machine to lift hundreds of times during each working hour not only the clampbar, but the cross-bar and their attachments. It is evident that in operating the old cutter for a day the operator will be called upon to lift hundreds of tons of iron if the rack is attached to or a part of the cross-bar, as was necessary in the previous construction. Notproportion to the quickness of the movement, l

the moving of the clamp-bar andV the crossbar by the hand-wheel I-I employs a considerable effort to move the mass of iron composing them, and as in this invention only the thrust-blocks, which are very light, have to be moved lquickly the strain upon the operator is correspondingly diminished, and therefore the speed with which the machine may be operated'during an entire days work is very much increased, and the actual amount of Weight lifted is very much decreased. Oonsequently this invention works a great economy in labor and expenditure of strength, and the machine becomes capable of doing 'a largely-increased amount of work in a day by the use of an average amount of strength on the part of the operator.

As an alternative method of operating the v clamp-bar by and from racks located below the table the cross-bar K may be omitted, and the links or straps L L being made large enough forV the purpose at that point-that is, below the table-the toothed thrust-blocks may be located in boxes provided therein. In this construction the pinions acting on the thrust-blocks seated in boxes or seats in the links below the table will operate the clampbar in clamping substantially in the same manner as heretofore described.

I do not desire to confine my invention to the method of counterbalancing the cross-bar and the clamp-bar shown in the drawings and heretofore described in the specification, as the objects of the counterbalance may be accomplished in a number of other ways without avoiding my invention.

The cross-bar, and with it the clamp-bar, are movable up and down and vertically movable only downward by the act-ion of the thrust-blocks, because the cross-bar is always freely movable downward on the thrustblocks, except as it may be arrested and prevented by the clamp-bar in contact with the table or the pile of paper located thereon. The only movement communicated to the cross-bar and through it to the clamp-bar by the thrust-blocks is a downward motion, and the thrustblocks when lifted always lift freely and without any resistance from the cross-bar, the clamp bar, the treadle, the counterbalance, or the foot of the operator carelessly left on the treadle.

I claim as my inventionl. A cross-bar of a paper-cutting machine connected to and in combination with a clampbar of a paper-cutting machine, provided with a cross-bar thrust-block located and movable vertically in a cross-bar thrust-block box, and

.provided with a rack and a pinion for operating the thrust-block and also for operating the cross-bar and the clamp-bar in clamping.

2. A cross-bar of a paper-cutting machine provided with a treadle and counterbalance attachment and connected to and in combination with aclamp-bar, and provided with one or more thrust-blocks located invone or IOO IIO

more boxes in the cross-bar, the cross-bar being movable, up and down, on the thrust block or blocks, and vertically movable only downward by the thrust block or blocks, each of which is provided with a toothed rack.

3. A cross-bar of a paper-cutting machine provided with a treadle and counterbalance attachment and connected to and in combination with a clamp-bar, and provided with one or more thrustblooks located in one or moreboxes in the cross-bar, the cross-bar being movable, up and down, on the thrust block or blocks, and vertically movable only downward by the thrust block or blocks, each of which is provided with a toothed rack and pinion.

4. A cross-bar of a paper-cutting machine connected to and in combination with a clampbar, and one or more thrust-blocks located in one or more boxes in the cross-bar, the crossbar being vertically movable, up and down, on the thrust blocks by a foot-lever and counterbalance, and vertically movable only downward by the thrust block or blocks provided with a toothed rack and held and operated by a pinion and in combination with one or more toothed racks and pinions.-

5. In a paper-cutting machine and in combination, a clamp-bar, a connected cross-bar, one or more thrust-blocks located in one o1' more boxes in the cross-bar and each thrustblock provided with a toothed rack, a pinion for each thrust-block, and a foot-lever and counterbalance connected with the cross-bar, substantially as and for the purpose described.

' 6. In a paper-cutting machine and in combination, the clamp bar C, the connected cross-bar K, the thrust block or blocks E, the pinion or pinions P and means for operating the same, the foot-lever M and counterbalance, and the connecting mechanism between the foot-lever and the cross-bar, substantially as shown and described.

HERMANN LORD SANBORN.

Witnesses:

JAMES A. SKILToN, EDWARD S. BERRALL. 

